What is Motion Blur, Judder reduction, Motion Lag and Game Lag?
by Phil Conner
All of these terms deal with phenomena related to motion resolution or otherwise incorrectly called motion enhancement that are prevelent and obvious in LCD TV technologies - though it can occur in any TV technology.
Judder refers to a jerky movement scene on screen when a 24fps camera pans quickly and the motion interpolation of the 3:2 pulldown in the TV cannot keep up - causing uneven images. It can also occur when the camara pans slowly and the TV processing cannot smooth out the "rough edges." Judder reduction is of course a feature included in some TVs that attempts to eliminate this effect. Judder is quite distracting to some, including yours truly. It's sometimes even more of a problem than fast moving images because it can occur as a camera pans slowly across a scene as well.
Blur reduction refers to much the same type of experience though motion blur applies more to a blurring of fast movement on screen as the TV processors struggle to keep up with on screen images. Fast motion sports programming and gaming are good examples of content that often cause this problem. This problem also applies more to LCD TV technologies as the twisting crystals struggle to keep up the fast motion to present the images smoothly.
Motion Lag is very much the same thing as motion blur but applies more broadly to include jerky judder issues as well as blurring.
Game lag is not a problem of picture quality, it occurs because of the picture processing going on inside the TV. When the image is output from the gaming device the picture is processed by the television's processor and then displayed, this causes actions created by player input to appear to lag behind the inputs themselves, making games requiring precision control harder if not impossible to play well. Many TVs now include a gaming mode that cuts down the picture processing to display the image on the screen faster thereby reducing or eliminating the input delay.
Lately, many LCD/LED television have a feature related to motion related processing issues. Increasing the speed of the frame rate processing is a primary way to fight fast motion issues - the features being 120Hz, 240Hz, and now some are stating 480Hz. See our complete article about these faster frame rate speeds, 60Hz vs. 120Hz vs. 240Hz vs. 480Hz - LCD Response Rate. The Hz rate features are often called something different in the TVs menu system such as Auto Motion Plus, Trumotion 120Hz, or Aquo Motion.